Streptococcus pneumonia is the leading cause of bacterial pneumonia. It can enter your lungs through inhalation or through your bloodstream. There is a vaccination for this type. Haemophilus influenzae is the second most common cause of bacterial pneumonia.
The droppings are similar in color to the wood residue that the insects spill as they eat. Subterranean termite droppings are soft and used in constructing nests, whereas drywood termite droppings are hard and look like piles of sawdust, according to Extension.org.
Most of the droppings are inside the soffit and attic of course, since that's where the bats roost, but many of them tumble out and onto the roof and then onto the ground. As you can see, they look like brown grains of rice. A common scenario is droppings falling out of an entry gap and onto a roof below. Again, the vast bulk of the bat turds are inside the building, but some spill out and onto the roof shingles.